My .500 Jeffrey cases last pretty well. I'm currently using 3 different makes, (Sabi, Stewart & Romey). The Sabi & Stewart cases hardly ever need trimming and seemingly go on for ever without failing......the Romey ones need trimming every 3rd or 4th reload and seem to split, stretch or collapse after (+/-) 8 reloads. At the end of day I guess it's all about quality. Of the three makes, I prefer the Stewart products.

Stewart incidentally now makes all my bullets as well and I'm as pleased as punch with them........I even got to design my own profile at no extra cost. I just told him what I wanted and he made me a few variations on the theme and I tested them all and then chose my favourite.